<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			var a = 10;
			var b ='xiaoyao';
			console.log(isNaN(a));
			console.log(isNaN(b));
			// 用来判断数据是不是非数值,非数值返回true,数值返回false
		</script>
	</head>
	<body>
	</body>
</html>
